FIELD: analytical technics. SUBSTANCE: analytic device for fluids, in particular, for measuring content of nutritive salts in water under treatment or in waste water has sealed casing containing: reservoir to keep carrying fluid; pump to produce flow of carrying fluid in flow channel formed by membrane and special means providing displacement of ions and molecules through the membrane from the fluid being analyzed into carrying fluid; reactor passage for test fluid flow; pump to feed fluid into reactor passage; and detector connected with reactor passage to detect reaction product and give corresponding signal. EFFECT: facilitated analytical procedure. 12 cl, 4 dwg
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